well partly. I think zero SB's is significant and that's why I'd never include Marino in "greatest ever" talk. at the same time, Terry Bradshaw has 4 but he also belongs nowhere near "greatest ever" talk as well.
it's gotta be a mix of stats & winning, imo. That's why Montana is the unquestioned greatest ever in my world. Guys like Unitas, Young, Favre i am inclined to put ahead of Brady right now, but if he gets a 4th then I say there's no question he's ahead of all of them except Montana.
Manning needs to win a 2nd before I consider him in greatest ever talk. His first one hardly counts since he had to outduel Rex Grossman to win it.